Cutter-head.



A. -BL LANDIS.

GUTTER HEAD. APPLIUATIONIILED JAN. 26, 1907.

a SHEETS-SHEET 1.

` Patented Feb. 8'

.www NN .MN ww A. B. LANDIS. I

GUTTER HEAD.

APIJLIGATION FILED JAN. 26, 1907.

Palellted Feb. 8, 1910.

3 SHEETS-SHEET 2.

A. B. LANDIS.

GUTTER HEAD.

APPLIUATION FILED JAN. 2s, 1907.v

M.. Patented Feb.' 8, 1910.

l 3 BHEETSr-SHEET 3. 5@ 8' c" ABRAHAM B. LANDIs, or WAYNEsBono', PENNSYLVANIA.

` GUTTER-HEAD.

specification of Letters Patent. Patented Feb. 8, 1910.

Application filed January 26, 1907. Serial No. 354,332.

To all whom it may concern.'

Be it known thatl, ABRAHAM B. LANDIS,

' a citizen of the United States, residing at Waynesboro, in the county of Franklin and State of Pennsylvania, have invented certain newfand useful Improvements in Cutter-Heads, of which'the following is a specific-ation.

`My said invention consists incertain im* provements inthe details of construction Vand arrangement of parts of .cutter-heads for machines for cutting threads on bolts,

screws, etc., of that general character shown in my former patents .Nos 690,300 and 409,208, whereby the construction is Simpliied and rendcredlmore positive -in operation and result," all as will be hereinafter morefully described and claimed.

'Referring to the accompanying drawings which are made a part hereof and on which similar reference characters indicate similar parts, Figure 1 is a side elevation of a'por*-. tion of the bed of a screw cutting machine showing thecutter-head and work carrying table in the position uthey occupy in such a machine, Fig. 2 a view looking in the direc- 'tion indicated by the arrows from the dotted line 2--2 in Fig. l, the cutter-head being in-t dicated by dot-ted lines, Fig. 3 a front elevation ofthe Work holding carriage, separate from' the machine, Fig. 4 ,a side elevation thereof, Fig. 5 a front elevation of. the cut.-

j ter-head with the cutter-holders omitte'd,

Fig. G a similar view with the .cutter-holders'in position, Fig. 7 a longitudinal section throughthe cutter-head on the dotted line 7-7 in Fig. 5, the parts being shown inthe position as .when the die isclosed for operation, Fig. 8 a similar view showing the partsVV inthe position' they occupy when the die is open, Fig. 9a rear elevat-ion'ofthe cutter die withthe parts as when the die is closed', Fig. 10 a detail view looking in the direction indicated bythe arrows from the dotted line 10' -.10 in-Fig. 9, Fig. 11 4a detail sectional `View on the dotted line 11-11 in Fig.10,

. Fig. 12 a detail section on the dotted line 12-12 inFig. 9, Fig. 13 a detail'view on.

an enlarged scale' looking in the direction indicated by the arrows from'the dotted llne l13-13 in Fig. '12, Fig. 14, a cross section,

looking in *the` direction indicated by the arrows from the :dotted line 147-14 13, Figsrl, 16 and 17 are views slmilar to Figs. 9,-, 10 and 12 except the parts are die is open instead of When it is closed, and

Figs. 18, 19, '20 and 21 detail views illustratlng more clearly the vparticular form of specific parts.'

In said drawingsthe portions marked A represent` the bed of the machine, B the work holding carriage and C the cutter head easing or frame. o

The bed A may be any suitable bed for a machine of thecharacter mentioned, provided with bearings for the cutter-head spindle and ways-for. the work holding carriage and the necessary bearings and supports for the various parts of the mechanism.

The work supporting carriage B is mounted upon ways on 'the carriage and adapted to be operated back and forth by any4 'suitable gearing and comprises a s'uitable rame'or support B for the work-holding jaws b. Said part B is adjustably mounted on an upright portion of the carriage B, by means of set-screws b which project through holes larger than said setscrews in said upright part and into screwthreaded perforations in said part B', thus providing that said part B may be adjusted both vertically and transversely and iirmly the top edge of said upright part of the carriage B, thusfurnishing adjustable, su ports forsaidpart B', to so hold it in t e proper vertictl adjustment that the jaws b will be in position to clamp the work in true alinementwith the cutter die.

l The cutter-head C is mounted upon a spindle l insuitable bearings A9 on the top of the frame or bed A, and comprises an outside hollow casing with an open front end adapted to receive an inner casing C', which iS mounted to'have a limited lon itudinal movement therein. Said inner caslng C is formed with four llongitudinal perforations around its axis, arranged equal distance apart, forming seats adapted to contain the cylinders C2, which are .provided with, projecting pins o on their frontends -for carrying the cutter holders C3. Said cylinders C2 are secured in their respective seats in the casing C by means of spring pawls o mounted in transverse sockets therein and adapted to engage with notches in the walls of their seats in said casing C, as mostlainly shown in Fig. 7. Said casing C is ormed with a central perforation which cuts into each of said cylinder seats, and a small section of each of the adjacent faces of said cylinders projects into said central perforation and is formed with gear teeth thereon, which are adapted to engage with ear teeth formed on the outside of a cyliner C4, which extends through said central perforation, being mounted at its rear end in a bearing in the head of casing C and at its forward end in a bearing formed in the front end of easing C. A Wheel vC5 is mounted on said cylinder near its rear end yand is provided with teeth on its periphery is shouldered and is inserted from the large feo end of the transverse way in casing C, after being inserted through the rack C, as shown in Fig. 5 by dotted lines, the shoulder abutting against a shoulder in said way, the large, end of which'is closed by a :screw plus :e u

In one side of casing C 1s formed a circular recess, as indicated most plainly in Figs. 10, l1, and 16, in which is mounted upon a stud c3 a stiff double leaf-spring c4, the two branches of which have their front which extend at an angle from each other,

-with 'a stud c7 interposed between said branches at the point of the angle, as shown. A stud ca is mounted in the wallof the casing C and its inner end projects to between the points c5 and ce of said spring 04. A lever C7 is mounted on a pivot bolt or stud c in casing C at one side of the recess, its inner end being adapted to engage with a notch in said casing C so that as said lever C7 is thrown back and forth upon its pivot it will rock said casing C within said casing C.

At a point substantially midway between two of the cylinders C2 a short shaft 2 is journaled in a bearing in the head of casing C havin a crank-wheel 3 on its outer end provi ed with a crank pin 4 projecting therefrom. Its inner end -is formed elliptical in shape, as shown 4most clearly in Figs.. 19, 20 and 21, and isadapted to engage with either one or the other of sockets 5 and 6 in the end o'f casing C', adjacent thereto. Wheel 3 has two sockets 7 and 8 formed on its underside diametrieally opposite each other and a spring pawl 9 is mounted in a socket alongside of shaft 2 normally midway between sockets 7 and 8 as indicated by dotted lines in Fig. 15, and adapted to engage with one or the other of said sockets and lock said shaft in a position to hold the shaft 2 in the position shown in Fig. 21,

as will be presently described. Around the outer end of said shaft 2 is formed a circular groove in the head of casing C under the wheel 3, which groove is divided into two equal portions by means of studs or pins 10 set therein-at diametrically opposite points, forming semicircular pockets. Coiled springs 11 are mounted in said pockets between said pins 10 on both sides there of and a stud or pin 12 is mounted in the underside of wheel 3, one on each side thereof, in position to project between the ends of said springs 11 and between the studs or pins 10. Said springs thus serve to normally hold the wheel 3 and the shaftl 2 with its elliptical or cam-shaped inner end in normal position, as shown in Fig. 20.

lThe spring pawl 9, consists of a head with a tapered point adapted to engage with one of the sockets 7 or 8 in wheel 3, and a stem mounted to telescope within a tubular part 13, which is mounted i`n an enlarged section at the inner end of the socket formed in said part C to contain said pawl. A coiled spring 14 is mounted around the stem on said pawl 9 between its head and the inner end of said part 13. Another coiled spring 15 is mounted between a shoulder formed near the inner end of said part 13 and the shoulder at the inner end of the enlarged section of the socket, as lshown most clearly in Figs. 12 and 17. Thus as the casing C moves outward in a longitudinal direction within casin C, as shown in Fig. 17, the

spring 15 wi l operate to cause tubular part 13 to follow casing C and draw the pawl 9out of engagement with wheel 3, when springs 1,1 will return wheel 3 to normal i position, as shown in Fig. 20. When the parts are closed, as shown inF ig. 12, spring 14 is compressed by the end of the part 13 sliding over the stem of pawl-9 so that said pawl is forced by the pressure of sai'd spring under its head outwardly to bear against the wheel 3 in position to spring into one of the sockets 7 or 8, therein, when brought to position to 'register therewith.

In operation the cutters C9 being in the position in the cutter holdersC3, as shown in Fig. 6, and as shown in my other patents above referred to, and the cutter-head C and work holding carriage B being in the respective positions on the machine as shown in Fig. 1, the die being closed and the-cutter? head in rapid'. rotation, as is well understood, the operator forces the work holding carriage B, carrying the work W, forward into the, die,.which serves to cut the thread thereon for the distance desired. When the :ceases a carriage B has been advancedv to the'point required to secure the l'engthof cut desired on the boltor screw, an arm B5 on said carriage will contact with an4 adjustable sto 20 on a rod 21, which stop is fixed to linut the movement of said carriage at the required position. The inner end of said rod 2O abuts a lug 26 on bed A and holds the carriage stationary. The die continuing to cut on the work w the inner part C of the casing, carrying the four cylinders and the cutters, is drawn out from the position shown in Figs. 7 and 12 to that shown in Figs. 8 and 17. As soon as the parts are separated the pin 2 is released from its engagement with socket 5 or 6, and the spring c4 aided by the action of cutting force operates to turn part C from the closed osition shown in Fig. 10.to the open position shown in"I Figs; 16 and 17 and through the central gear C4 operates to rock cylin ers C2 and open the die, when the work may be withdrawn. Said spring c4 operates as follows: When the parts C and C are locked together to hold the die closed it occupies the position in relation to pin 08 as shown in Figs. 10 and 11, in which position said pin 08 is out of line with thecentral line or" said spring and bears upon the lower leaf thereof. Said spring sthus eXertin its tension upon the lower side of said pin 08 Whilethe die is closed. Therefore, immediately upon the end of shaft 2 being withdrawn from socket 6, the lower inclined part 06 of said spring o4 will at once, by reason of its spring force exerted against the side of pines, turn the casings C and C to bring them into relation so that said pin o8 will the spring against said pin o8 is largely increased during the operation of drawing casing C longitudinally of casing C, as this movement carries said spring outward with part C so that its lower leai is sprung outward over said pin, as will be readily seen. The turning of casing C serves to turn the cylinders C2 carired in casing C slightly around the toothed cylinder C4 and operates to open the die which is held open by the inner end lof shaft 2 resting' on the end of casing C. at one side of thesockets 5 and 6,-

as shown in Fig. 17.- The carriage is' then run back by the operator until the arm B's contacts with another strike 25 adjustably fixed on the rear end of rod 21, which rod is pivotally connected to the upper end of a bell-crank lever 26 which is mounted on a cross shaft 27, its other end being weighted, as shown. This serves to rock said shaft to throw a central arm 28 thereon into posi* tion so that a spring Contact face 29 on its upper end will be in the path of lever C7 projecting from one side of the cutter-head As said cutter-head revolves and lever C7 contacts with said spring 29 said lever is The tension of thrown to turn the casingC' back toffirst described position to close the die, and bring the inner end of'shaft 2 in position to regi ister with the appropriate socket 5 or 6.

The pin o8 being, by this movement of part C, thrown downwardly across the inclined face 06 of' spring ct, said spring acting against said pin, will tend to slide the part C back to the position shown in Fig. 7 and atthe same time cause the inner end of shaft 2 to engage with the appropriate socket inA part C and lock it firmly 1n its normal position. Spring 04 thus operates to close the parts C and C and the socket 6 of said part C passes over the elliptical end of shaft 2y and the parts C and C are thus againlocked against independent rotary motion and the die is held closed for the next operation. When it is desired to make a second, or

finishing cut on the screw, the operator runs the carriage back and at the same time pushes a sliding trip 22, mounted in a suitable socket 23 on the top of casing A forward, by means of a handle 24, into the path of the crank-pin 4 on the wheel 3. As said crank-pin comes around in position to hit said trip it operates to give wheel 3 a quarter turn, which turns the elliptical inner end of shaft 2 from the position shown in Fig. 20 to that shown in Fig. 21 and brings one of the sockets 7 or 8 to position to receive pawl 9 and lock wheel 3' in this position, which slightly closes the die for said finishing c ut, the operation serving to rock part C slightly and through central gear C4 to turn the cylinders C2 to close up the die for said second or finishing cut. As soon as the die is opened, as before described, the pawl 9 falls out ofengagement with wheel 3 and springs llreturn shaft 2 to its normal position.

Presuming that the operation, and the position of parts just described, are arranged for the cutting of a right hand thread, when it is desired to cut a left hand thread the normal locked position of the parts C and C will be changed to bring the socket 5 in part C to register with the inner end of the shaft 2, instead of the socket 6 as shown in Figs. 20 and 21. The cutter holders are changed so as to operate with the cutter head revolving in the reverse direction, when the operation will be as above described for opening and closing the die and holding it closed during the operation.

The .adjustment of the rack-bar C by means of the screws c2 will adjust the fixed `closed position of the cutters composing the die in relation to each other, so as to secure the size of die required for the work to be done. By adjusting the jaw holding head or frame B, by the means before described the work can be brought into true alinement vwith the cutter-head and thus most perfect results accomplished.

I l-laving thus ful-ly described my said', invention, what I claim as new and desire to.

- secure by Letters Patent, is

1. A cutter-head .comprising a casi-ng formed in two parts, one mounted within the other and arra d to have a limited rotary andA longitu inal movement inde'- pendentJ vof eachother, a locking device mounted inA one part and ada ted toI engage with the other andarrange tohold said parts from independent rotary movement when in locked position, and a spring secured to one part and bearing against the other part arranged to force and normally hold said two parts in closed position, substantially as set forth. i

2. A cutter-head comprising a casing composed of two parts, one mounted within the other, the inner part being formed with sockets toreceive the cutter-holding cylinders, said cutter-holding cylinders mounted in said sockets and formed with teeth on their adjacent faces, a central cylinder in` said outer part containing teeth on its pe` riphery adapted to mesh with the teeth on the adjacent faces of said cutter-holding cylinders, means for adjusting and securing said central cylinder, means for locking said two parts of the casing against independent rotary movement when 1n closed position, and a spring mounted in a recess between the walls of said two parts adapted to bear against said parts to normally close them when the locking device is in position for engagement, substantially as set forth.

3. In a cutter-head, the 4combination of the outer casing mounted on the spindle, the inner casing mounted withi"said-outer casing, andcontaining the sockets for the cut- \terholding cylinders, said cutter-holding cylinders, Athe cutters mounted thereon, means for holding said cylinders in a fixed relation to secure the size of the die desired, and means for opening and closing said die comprisinof av spring mounted in a recess between said two parts of the casing adapted when the locking means is released to impart a limited rotary movement tothe inner casing to open the die, and to slide the two parts together wheny `the locking device `is in position for engagement, substantially as set v forth.

4. 1n a thread-cutting machine, the combmation, of the caslng composed of an outer part and an inner part mounted to have a limited rotary and longitudinal movement, a

locking device for securing said two parts when closed against independent rotary movement comprising a shaft carrying a cam shaped inner end adapted to engage with a socket in the end of said inner part, means for rocking said shaft, means for sliding the inner casing longitudinally to free said lookin device from said socket means for returning said inner part to nor- .formed with teeth u onztheir adjacent memes mat position and locking intheeutterliold? ing-cylinders mounted. said inner part,

and the cutters carried by said cylinders, all ifnounted and arranged substantially as set ort. t

5. In a threadcutting machindthe combination, of the casing comprising an 'outer and an inner part formedand arranged to have a limited independent rotary and-longitudinal movement, the cutter holding cylinders mounted in sockets in said inner art i s, a central toothed cy inder ada ted to-engge wi-thl said teeth and hold sai cylinders 1n fixed relative. position, means for locking the two parts, of said casing against independent rotary movement', means for releasing said locking device, and means for i-marting a limited rotary movement to the inner part of the casing carrying the cutter holding cylinder immediately upon the reI lease of said locking device, whereby the die is automatically opened,fsubstantiall=y as set forth.

6. In a thread-cutting machine, the combination of a casing composed of two parts, one mounted within the other, and having limited independent -rotary and longitudinal movement, said inner' part formed with sockets tocontain the cutter holding cylinders, said cutter holding cylinders formed with teeth on their adjacent sides, a central toothed cylinder meshing with said teeth on v said cut-ter holding cylinders, meansfor adjusting said central c linder to adjust the ,relative position of saidcutter holding c linders and 'thus adjust the size of the ie, means for locking the two parts of said casing vwhen closed against independent rotary movement, means for releasing said locking device at the end of each cutting operation,

means for imparting a limited rotary movement to the inner part of the casing when said locking device is released, whereby said die is opened, means for forcibly returning said inner part to the position to close said die, and means for automatically thitowing it into engagement with the locking. device when brought to this position, substantially as set forth.

7. ln a thread-cutting. mach-ine, the combination, of the casing comprising the outer part, the inner part mounted therein to have a limited independent rotary and longitudinal movement, said inner part having sockets for the cutter holding cylinders, said cutter holdin@r cylinders mounted therein, means .for holding said cylinders in xed relative positions, the cutter holders, the cutters mounted thereon to form the die, means for locking the two parts of the casing againstindependent rotary movement when in closed position, means for releasing said locking device, means for imparting a lim- Aited rotary `movement to said inner part the casing formed' in two part carrymg the cutter holders, means for when .said locking substantially as set forth.l

8. In a cutter-head, the combination, of parts, the inner giving tosaid inner part a. limited longitudinal and rotary movement, means forI locking said two part-s. in' closed position,

and means for returning them to closed posithe casing composed of two parts one within the closed, means for tion after being -forth.

5). In a cutter-head, the combination, of

' mounted other, theV inner part lnounted to have a limited longitudinal and rotary motion, means for locking said two parts in closed position, means for releasin the lock- .lng mechanism, means for impartmg to the movement when said locking mechanism is released, whereby the die is opened, means for returning said inner part to position, and means for forcibly engaging the locking mechanism, sublstantially as set forth. i

10. In a thread-cutting machine, the combination, of the casing composed of an outer part mounted upon the spindle, aninner part mounted in said outer partto have a limited independent rotary and longitudinal movement, thecutter holding cylinders carrying the cutters composing the die mounted in said. inner part, means for securing them in xed relative positions,

means' for adjusting the size of the die as f required, means for l oeking said two against independent rotary movement when releasmg the locking mechanism, means opened, substantially as set parts for lmparting to the innerl part of the casin I movement when t e locking 'mechanism is released comprising a leaf spring mounted l in a recess in one side of the inner casing and formed with a tapered outer end ada' tf 'ed to bear against a fixed stud carried b 51e 1 outer casing, said stud beingt-o .onesi e of the center of said spring when the. parts are g in locked position, whereby when the locking mechanism is released it tends to throw an independent rotary' i said stud to a central position andthus ro tate said central forth.

g lll. A cutter-head com casing, onev mounted. wit

part, substantially as setrising a two part in the other and adapted. to have a limited independent ro-r tary and longitudinal movement, means for (parte against said inde-.

flocking said two i iendent rotary an longitudinal movement when closed, means for releasingthe locking mechanism, means -for imparting to one part an independent rotarymovement when the locking mechanism is released comprising 'a leaf spring mounted in a recess in one side of the inner casing and formed with. f a tapered outer end adapted to bearagainst j a fixed stud carriedby the other part, said stud being on one side of saidsprmg when i the parts are in locked position, whereby when the locking mechanism' is released said spring tends to throw said stud to a central 5 position and thus rotate said other part, subi stantially as set'forth. I In witness whereof, I have hereunto set l my'hand and seal at Washington, .D. C., l this 22nd day .of January, A. D. nmeteen A. M. PARKINS. 

